diff --git a/tests/test_options_margin_mode.py b/tests/test_options_margin_mode.py
index 1803541..81f0e2c 100644
--- a/tests/test_options_margin_mode.py
+++ b/tests/test_options_margin_mode.py
@@ -68,7 +68,7 @@ class TestOptionsMarginMode(unittest.TestCase):
     def test_sheets_from_coin(self):
         from lib.options.options_margin_mode_lib import calc_sheets_from_coin_balance
 
-        # ask 0.01 ETH per 1 ETH, ctMult 0.01 → 每张 0.0001 ETH; 0.01 ETH 可开 100 张
+        # ask 0.01 ETH per 1 ETH, ctMult 0.01 → 每张 0.0001 ETH; 0.01 ETH×0.97 缓冲可开 97 张
         r = calc_sheets_from_coin_balance(
             quote_per_unit=0.01,
             ct_mult=0.01,
@@ -76,7 +76,7 @@ class TestOptionsMarginMode(unittest.TestCase):
             coin_available=0.01,
         )
         self.assertTrue(r["ok"])
-        self.assertEqual(r["sheets"], 100)
+        self.assertEqual(r["sheets"], 97)
 
 
 if __name__ == "__main__":